Larry Brooks says "writing voice is like air: If you can smell it, something is cooking, and it may not be appetising to everyone." He says the best style is to write cleanly and crisply. And simply. "Sort of like that breath of fresh air, the hallmark of which is that it doesn't smell like anything at all. It's just, well, pleasant. It flows. It goes down easy."
He also says voice "...will come to you, first in a whisper, and finally with a proud and stubborn shout. And once it announces itself and declares who you are as a writer, allow it to take over from there."
I have my voice for my weekly CSA newsletters. I use the same first person with omniscent voice-over commentary in gardening articles.
I'm having to amend that voice for my romances, but I think I'm getting closer...